Add a persistent Parakeet helper for low-latency host integrations (#… #1528

Job	Run time
test-webgpu / test-backend-linux (webgpu, operators) / linux-job	48m 42s
test-webgpu / test-backend-linux (webgpu, models) / linux-job	26m 44s
test-webgpu / test-backend-macos	-1s
test-webgpu / package-golden-artifacts	1m 34s
	1h 16m 59s

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